[time-nuts] AVAR calculation

[John Miles]

Ulrich's PLOTTER application is a good tool for that; mine doesn't support
frequency input yet.  If you haven't tried PLOTTER, it's the second download
on the page at http://ulrich-bangert.de/html/downloads.html .  Be sure to
select "Data is frequency" from the Time Stability Statistics menu.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Tom Van Baak
> Sent: Sunday, January 10, 2010 2:01 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] AVAR calculation
>
>
> Hi Filip,
>
> See attached. Let me know how your results differ from this.
>
> It looks like 1.75 hours of frequency data of a 250 MHz DUT.
>
> You first convert your raw frequency measurement data into
> normalized frequency error data (i.e., subtract and divide by
> f0 = ~250 009 770 Hz).
>
> You can run the y- form (frequency) of an adev calculation
> directly, or integrate the frequency error series into a time
> error series and run the x- form (phase) of adev calculation.
>
> I can explain more if you wish.
>
> JohnM and UlrichB can double check this plot with their tools.
>
> /tvb
>
> ----- Original Message -----
> From: "Filip Ozimek" <me_super at o2.pl>
> To: <time-nuts at febo.com>
> Sent: Sunday, January 10, 2010 1:20 PM
> Subject: [time-nuts] AVAR calculation
>
>
> >
> > I'm trying to calculate AVAR from collected data, but I would
> expect a different behavior of my DUT. Does anybody can
> > calculate the AVAR for me?
> > Gate time was 1s, without any deadtime between measurements,
> > this is a file http://www.fuw.edu.pl/~fozimek/pomiar61-frep.txt
> > with collected data.
> >
> > Thanks,
> >
> > Filip Ozimek
> >
>